configure CI to publish build artifacts as tarballs

.github/workflows/publish-tarballs.yaml

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+# This workflow publishes m30pm build artifacts as tarballs
+
+name: Publish build artifacts as tarballs
+
+# Controls when the workflow will run
+on:
+  # Triggers the workflow on push events
+  push:
+    paths-ignore:
+      - '.gitignore'
+      - 'LICENSE'
+      - 'README.md'
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    if: "!contains(github.event.head_commit.message, 'skip ci')"
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - name: Checkout github repo
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Build m30pm
+        run: npm run build
+
+      - name: Package build artifacts as tarballs (for linux-x64)
+        run: oclif pack tarballs --targets linux-x64
+
+      - name: Upload build artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: m30pm-tarballs
+          path: dist/m30pm-v*
+